Rotary-motor tool



Dec. 27, 1927.

J. J. N. VAN HAMERsvELD ET Al.

ROTARY MOTOR TOOL Filed Nov. 21. 1925 5 Sheets-Sheet l vwenozs 7@ VM 5MM] @mi /f/a/ L. COO- 3513 fan/( Dec. 27, 1927. 1,653,748

J. J. N, VAN HAMERSVELD ET AL ROTARY MOTOR TOOL Filed Nov. 21, 1925 I5 Sheets-Shee 2 S 'ffii @VII/(lei af ifaZL-OG/- Dec. 27, 1927.

J, Jj N. VAN HAMERSVELD ET AL ROTARY MOTOR TOOL' Filed Nov. 21, 1925 3 Sheets-Sheet 5 Mm. mw

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JQHN nl'. lll'. VAN HAMERSVELD AND HAL L. CQOK, GF CLEVELANDHEIGHTS, OHI, AS- SIGNORS, RY MESNE ASSIGNMENTS, TO THE RTQR MR, TOOK; COMPANY, F CLEVE- LAND, GEIQ, CORPORTIN 0F OHIO.

normar-moron roer..

.application tiled November .21, w25. Serial lilo.. www.

This invention relates to rotaryv motor` the ports and ypassageways are termed al most entirely by drilling operations.

A. still further object is to so term and arrange the Valve controlling the air orother tluid pressure as to permit the ready manipulation of the valve when thetool is in the-hands of the operator, and at the same time rovide a more direct dow for the motive uid than heretofore, with the result that there isless skin friction and loss ot power.v

'lhe above and other objects are attained by the present` invention, which may be briefly summarized as consisting` in certain novel details of construction, and combinations and arrangements ot parts which will `be described in thel specication and sety forth in the appended claims.

'inthe accompanying sheets oit drawings wherein we have shown'the preferred embodiment of the invention, Fig. l is a top planview oit a rotary grinder with a motor constructed in accordance with our invention,

the top cap and gasket being removed; Fig.

2 is a longitudinal sectional viewl ofthe same, the pistons being in elevation; Fig.' 3, 1s ar transverse sectional view substantially along the line 3-31of Fig. 2; Fig. 4/ is a transverse sectional view substantiallyalong the line t-d of Fig. 1, omitting a portion of the end bracket; Fig. '5 is an enlarged longitudinal sectional-view omitting portions ot the handles or end brackets; Fig. .6 is a transversesectional View substantially along the line 6-6 'of Fig. 5; Fig. 7 is a longitudinal sectional View through the center of the cylinder body; Fig. 8 is a sectional yiew through the cylinder body,.sub stant1ally alongthe line 8-8 ofFig. 7; Fig. 91s a fragmentary sectional view through a portion ot the handle bracket, substantially along the line 9-9 oit Fig. l0, showing particularly the valve by which the motive tluid is controlled, and certain ofthe 'pas` sageways` therefor through the end bracket, end plate and the cylinder body g` Fig. l0 is a. sectional view substantially along 'the line ith-lo oit Fig. e; Fig. il is a sectional view ot the valve showing the inner adiustable member. displaced trom normal position to reduce the etective size of the valve opening.

lhe motor includes a cylinder body or casting l5, shown detached in Figs.. Z and 8, and two handle members or end brackets i6 and il", which are secured to opposite ends of the cylinder body, with intervening end plates i8 and i9. 'Ehe end bracket 16 in `this instance has'a straight handle portion loa arranged opposite, in line with the spindle 20, 'the motive duid, in this instance air, being introduced through this end bracket and its handle portion, andthe valve rlhe cylinder body is provided with two cylinders which accommodate two eccentric pistons 23 and 23, preferably keyed to the shaft and arranged 180 apart. ln forming the cylinders, the cylinder body. l5 is given a straight-bore 15a extending from end to, end thereof. (See Fig. 7). rllhe cylinders are formed by the cylinder body, the two end plates 18 and i9, and an intermediate member 24 which separates the cylinders, and in this instance constitutes a housing for a center anti-friction bearing 25 for the spindle 20. The spindle is supported by the bearing 25, justreterred to, and a second anti-friction bearing 26 which is 'located at the outer end of the sleeve-like extension 1.7a of end bracket 17, this arrangement of the bearings being one of the important parts ofthe present inven- (See Fig.

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tion, it being a feature thereof that the spindle is supported independently of the end bracket 16. By reason of the fact that the bearing is located `between and -close to both pistons it is obvious that a ported independently of bracket 16, it is obvious that careful alignment in so far as the assembly of this bracket to the cylinder body is concerned is unnecessary. This ar rangement 'of bearings admits of a much closer appearance thanheretofore between the pistons and the cylinder-forming portions of the cylinder body, resulting in a better sealing effect, reducing leakage and giving increased speed and power.

The endbrackets 16 and 17, the end plates 18 and 19 'and the cylinder body are all secured together by a series of parallel bolts 27-arranged preferably 90 apart, as illustrated in Figs. 6 andA 10.

IBetween two of the'bolts 27 the cylinder` body is provided with an extension 15b (see Fig. 6) through which extends an air inlet passageway 28 and an air outlet passageway 29 which are formed by drilling openings longitudinall through the extension'of the cylinder bo y, from end to end thereof. Additionally this extension accommodates two radially movable abutment blades 30, the inner ends of which engage the outer annular surfaces of the two pistons. These abutment blades are slidingly sup orted in two radial lslots 15, which are marihined inward from opposite ends of the cylinderbody, leavinggbetween'them a solid portionl 15d. These slots 15 extend from the .flat

`outer portion of the extension 15, through body, Ytwo series of inlet paageways 31v which are drilled from the outerat face of the extension entirely thrcu h it so as to communicate with the cylin ers, and these passageways intersect the main axial inletl assagewa 28, as shown in Fig. 6 and in ig. 8. he cylinder body extension 15b is I provided -also with a series of exhaust passageways 32 which are drilled in a similar manner through the extension, these exhaust passageways intersecting the main exhaust passa eway 29 extending in an axial direction rough the extension 15".

As shown in the drawings, the inwardly extendin inlet passageways 31 are on ,one side of t e slots 15 which accommodate the the abutment blades, 'and the inwardly extending exhaust passageways are on the opposite side of said slots. The outer ends of theinlet passageways 31 are connected by 15 which receive the abutment blades, so v that the pressure of the air will be exerted down on the abutment blades, causing them at all times to be pressed against the pistons 23. (See Figs. '1 and 6.) The cylinder body extension 15b additionally-has a double row of laterally extending passageways 29 extending from. the main axial exhaust passageway-29 to the atmosphere, (see Figs. 6

`and 8,) the passageways 29 extending outwardly from themain exhaust passageway 29 at .closely spaced points for practically its full length.

The outer ends of the inlet passageways 31,'of theoutlet passageways 32 and of the abutment Vblade-receiving slots 15 are closed by a plate 34 which covers the outer flat face ofthe cylinder body extension 15", and is secured thereto by aseries of screws 35, there being preferably provided between the plate 34 and the outer face of the cylinder body extension, a packing strip or gasket 34 of suitable material, the same sealing the several passageways and `slots referred to, against leakage at this point.

It -is to be noted that the housing 24 for the center bearing 25 is annular in form, and has a close fit in the cylinder bore 15 of the cylinder body. Likewise it will be noted that in thickness this housing is the .same

as lthe thickness ofthe portion 15d. between the slots 15 for the abutment blades. This housing and the bearingl will be' accurately located in the cylinder body, and when so located are locked in that position* by a holding screw 36 extendingthrough the portion 15d of the; cylinder body and through the outer portion of the bearing housing 24, as clearly illustrated in Fig. 5, the head of the screw beingbeneath the. plate 34 so that access may be had to it by removing the plate. By properly locating and holding in position the bearing housingi24 in the manner stated, or in some e ulvalent way, the sides of the housing 24 crm continuations ofthe ends of the slots 15 in the cylinder body extension, and the inner ends of the abutment blades 30 slide4 freely over the sides of the bearing housing 24 as well. as the walls formed by the inner ends of the slots 15, just as effectively as the outer ends of the bladesl slide `over or on the end plates 18 and 19, which plates, as before stated,

-29 'extend axially entirely through thecylinder body, and as the slots 15, inlet passageways 31'. and exhaust Apassa eways 32 extend entlrely through the cylinder body extension 15. and the short slots 31* and lateral formthe outer ends of the cylinders as well im' exhaust passageways '29* extend entirely through .the walls in which. they are formed, the .cylinder body as a whole can be readily and accurately machined, and since the con- This communicates with a passageway 34 extending lengthwise of the handle portion 16 and leads to an extension 161? ofthe handle portion 16, this extension having a chamber receiving a cylindrically shaped hollow rotary valve 35, whose axis isparv is, portion and in close proximity thereto is a l allel to the axis of the motor. The valve has a stem 35a which projects out through the back ofthe extension 16p, and at the outer end of this stem, above the handle valve lever 35b of the butterfly type, so positioned 'with `respect to the handle portion 16, that thel operator with his lthumb or finger can rotate the valve in-either direction while-retaining his grip on the handle.

i The valve 35 isvtted into a sleeve 36, which D is vforced into the valve chamber of lthe extension 16", this sleeve having a port 36a in line with the passageway 34, as indicated in face toward the cylinder body, and the vinner Fig. 2, and the valve having a similar port leading to its interior.' This last-mentioned `port is adapted to be brought into vand out of alignment with the port 36 so as to start or stop the fiow of air, and, in fact, to control it so as to control the speed of the motor. A suitable spring 37 (see Fig. 9) is located between the back wall of the extension 16h and thelever 35b so as to prevent leakage of air out around the stem'of the valve, and

to hold the valve in any position in which it may be turned by the operator. A

The as well'as the opening in the valve proper,

portion of the valve chamber has .a lateral extensionl38 (see Figs. 9 and 10) which communicatesl with the main inlet passageway 28 extending longitudinally through the cyl 'inder body, as best indicated in Fig. 9.

Thus when the valve is turned so as to admit airto the cylinder body and cylin-` der, the air flows from the passageway 34 in the handle portion 16a through the bushing 36, and into the hollow valvev 35, and from the latter through thek extension 38 into `the main inlet passageway of the cylinder i body, and from this passageway it passes .by`

`the passageways 31 into the c linders.

By this construction .we o tain' a "more direct flow of air from the inlet connectionl to the cylinders than has heretofore been alve chamber in the extension 16h,

or turned in either direction without requiring that the operator remove or change his grip on thehandle portion 16a.

I ma if desired, place inside of the hollow va ve 35, an adjustable sleeve 35u, as illustrated in the drawings and shown most clearly in Figs. 9 and 11. This sleeve 35c is normally fixed with relation to the valve, and in this instance is secured. thereto by a screw 35d which passes through the closed end of the sleeve andinto the stem of the valve. This inner sleeve is provided with a port 35e. which is of the same size as the port in the valve proper, and normally the ports of the valve and sleeve are in full registration, but if desired, the inner sleeve can be adjusted circumferentially so as to reduce the effective size of thev valve p ort so as to better adapt the tool `for varying alf PIESSUI'GS.

sageway 34. Communication is establis led, between lubricant chamber 39 and passage.

way 34 just in advance of the valve, through a port' 40' controlled by a needle valve 41, which can be adjusted to vary the rate of flow of oil. Access may be had to the needle valve 4l by removinga sealing screw -42 (seeFig. 3), and after adjustment, the needle n Assuming that the tool 'is de-l signed for its most eflicient or'effective use,`

valve can be lockedl in position by a lockingscrew 43.- Lubricant is designed to be sup- 'plied to the chamber 39 by the removal of a screw plug 44, which is shown in Fig. 4.

It will be seen from the above, that'we have provided a rotary motor which has high eliiciency, and which, because of the refinements in construction, may ybe' oper.l

ated at high speed. Likewise, it will be seen that by the manner in which the ports and passageways are formed, not only is `uniformity and accuracy `obtained to ahigh degree, but the drilling and other machining can be vdone with rapidity, and the motors can `be made in quantities at a relatively low cost.

While we have shown the preferred con-l struction, we do not desire to be confined to thev exact details or arrangements shown, but aim in our claims to cover all modifications shaft extending through said sleeve-like exiov ytension and having a pair of eccentric pistons rotatable in the cylinder bore, abutment blades slidably mounted in the cylinder body and at their inner edges engaging'the istons, said shafthaving a single bearing` in the cylinder body, said'bearing being located between the pistons and having a second bearing remote from the cylinder body and located adjacent the outer end of said sleeve-like extension.

2. In a rotary motor, a cylinder body' having a cylindrical bore formed from end to end thereof, and having two radially disposed slots for abutment-blades extending from opposite ends of thek cylinder body inwardly toward the center and Iboth communicating with the cylinder bore, there being between the slots a solid portion, a

i rotor having two eccentric pistons in the cylinder body, and av separate member fitted in thebore between the pistons inside said solid portion. v

3. In a rotary motor, a cylinder body havinga cylinder bor'e formed from end to end thereof, and having an extension provided with inlet and outlet passageways extending through the extension from end to end of the cylinder body in parallel relation with the cylinder bore, and said extension being provided with' radial slots extending inwardly fi'om opposite ends of the cylinder body and from the outer face of the extension of said cylinder bore.

4. In a rotary motor, 'a cylinder body having a cylinder bore formed from end to end thereof and provided with a lateral extension, main inlet and exhaust passageways formed through said extension from end to end of the cylinder body in parallel relation with the eylinderbore, `and inlet and exhaust passageways formed through the extension at right angles to said main passagewa s and extending fromthe outer face of tie extension to said cylinder bore.

5. In a rotary motor, a cylinder body having a cylinder bore formed from end to end thereof and adapted to accommodate a shaft having two pistons, main inlet and exhaust passageways formed through the cylinder body from endto end. thereof in parallel relation with said cylindenbore, a pair of radial slotsarranged in alignment and extending from the outer face of the cylinder bodyinwardly to the cylinder bore,

each extending 'inwardly from one end of the cylindrical body, said slots being located sageways ,v inlet passageways insana between said main inlet and exhaust asexten ing through the wall' of the vcylinder body on one sideof the`slots and intersecting the main inlet passageway, and exhaust pas- ,sa eways extending through the wall of the c `nder body on the opposite side of said s ots and: intersecting the main exhaust passa eway.

6.' a rotary motoi, a cylinder body having a c linder bore formed from end to exhaust passageways formed through the cylinder body from end to end thereof in parallel relation with said cylinder bore, a pair of radial slots extendin from the outer face of the cylinder body inwardly to the cylinder bore, each extending inwardly from one end of the cylinder body, said slots being'located between said main and exhaust passageways, inlet passageways extending through the wall ofthe cylinder body on one sideofA the slots and intersecting the main inletassageway, and exhaust'passageways exten ing through the wall of the cylinder body on the opposite side of said slots and intersecting the main exhaust passageway, the outer ends of said last mentioned-inlet passageways communicating with the outer portions of said slots# 7. In a rotary motor, a cylinder body having a cylinder bore formed from end to end thereof and adapted to accommodate a shaft having two pistons, main inlet and exhaust passageways formed through the cylinder body from end to end thereof in parallel relation with said cylinder bore, a pair of radial slots extending from the outer face of the cylinder body inwardly to the cylinder bore, each extendin inwardly from one end of the cylinder bo y, said slots being located between'said main and exhaust passageways, inlet passageways extending through the wall of the cylinder body on one side of the slots and intersecting the main inlet passageway, and exhaust passagewa s extending through the wall of the cylinder body on the 'opposite side of said slotsand' intersecting the main exhaust passageway, and said cylinder body having exhaust passageways extending transversely through the wall thereof from the main exhaust passa eway to the outer side of the cylinder bo y, said last mentioned passageways being in spaced relation from substantially one end of the cylinder body to the other.

8. In a rotary motor tool, a Cylinder body liavino a cylinder bore formed from end to end thereof, a shaft having two pistons adapted to rotate in said cylinder. bore, radial slots extendinor inwardly from o posite endsofthe cylinder body toward t e center, members at the ends of the cylinder .end thereo and adapted to accommodate a y shaft-having two pistons, main inlet and hlt netart-a body forming two end walls of two cylin-v ders formed in the cylinder bore, a center bearing for the shaft and a housing for the bearing located between the pistons and between said slots, means extending through the cylinder body between the slots for locking said housing in position, and abutment blades slidable in said slots on opposite sides of the housing.

9, lin a rotary motor tool, a cylinder body having a bore extending from end to end therethrough, an extension having main inlet and exhaust passageways extending from end to end thereof in parallel relation with the cylinder bore, radial slots extending from the outer face of the extension to the cyiinder bore and extending from the outer ends of the cylinder body inwardly toward the center, inlet and exhaust passageways located on opposite sides of the slots and extending from the outer face of the exten` sion to the cylinder bore, the last mentioned inlet passageways intersecting said main inlet passageway and the exhaust passageways intersecting said main exhaust passageway, abutment blades slidable in said slots and at their inner edges engaging` the pistons, and a removable cover on the outer face of said extension.

' l0. In a rotary motor tool` a cylinder body having a bore extending from end to end therethrough, an extension having main iniet and exhaust passageways extending from end to end thereof in parallel relation with the cylinder bore, radial slots extending from the outer face of the extension to the cylinder bore and extending from the outer ends of the cylinder body inwardly toward the center, inlet and exhaust passageways located on opposite sides of the slots and extending from the outer face of the extension to the cylinder bore, the last mentioned inlet passageways intersecting said main inlet passageway and the last mentioned exhaust passageways intersecting said main exhaust passageway, abutmentblades slidable in said slots and at their inner edges engaging the pistons, a center bearing for the s aft, a housing for said center bearing located between the pistons and the blades, locking means for the housing extending through the extension between the blades, and a cover plate for the outer face of said extension and covering said locking means and the outer portions of the slots and of the last mentioned inlet 'and exhaust passageways.

ing, said shaft extending through one of said brackets, the other bracket having a handle portion located opposite the shaft and provided with an air passageway and with a rotatable valve offset laterally from the shaft and having an inwardly facing chamber formed on the inner face of the bracket and adapted to be placed in communication with said passageway, and said valve having a lever adjacent the said handle portion.

l2. A rotary motor tool comprising a casing having one or more cylinders, brackets at the ends of Said casing, one bracket having a sleeve-like extension constituting a handle portion, a shaft projecting through said extension and provided with one or more pistons in the casing, the other bracket having a handle portion substantially in line with the shaft, said handle portion hav ing a Huid passageway extending lengthwise therethrough and having a valve chamber communicating with said fluid passage- Way and directly with the casing, said valve chamber being offset laterally from said shaft and extending into the bracket from the inner face thereof, and a hollow valve in said chamberI adapted to open and close the communication between said pasfsageway and the casing and having an opening therein which faces or communicates with the chamber.

13. A rotary motor tool comprising a casing having'one or more cylinders, brackets at the ends of said cylinders, one bracket having a sleeve-like extension constituting a handle portion, a shaft projecting through said extension and provided with one or more pistons in the casing, the other bracket having a handle portion substantially in line with the shaft, said handle portion having a fluid passageway extending lengthwise therethrough and having a valve chamber communicating with said fluid passageway and directly with the casing, said valve chamber being oifset laterally from the shaftand extending into the bracket from the inner face thereof, a hollow valve in said chamber adapted to open and close the communication lbetween said passageway and the casing and having an opening therein which faces or communicates with the casing, and said handle portion having also a lubricant chamber extending longitudinally thereof and having a delivery port communicating with said passageway.

In testimony whereof, we hereunto aiix our signatures.

JUHN J. N. VAN HAMERSVELD. HAL L. COOK, 

